Hi, can someone explain to me, in simple terms, what zero input and zero state response mean? I know the terms should sort of be self explanatory in that zero input reponse is the response of a system when theres no input but how does that make sense? This is how I'm imagining it in my head right now: I have a circuit (ie an amplifier) that's just sitting on a desk with no signals inputted to it. Wouldn't zero-input response always be zero? How can the output of the circuit be a non-zero value if nothings going into it? Also about the zero-state response...what does that mean exactly? You are inputting something into the amplifier circuit in this case but what's it mean to have zero state? I hope someone can help, I've been able to do problems since I've learned the general method to solving them but I don't understand what's going on or why I'm doing what I'm doing when I solve my homework problems.